4-40X1/4 Phillips Pan Thread Cutting Screw Type F Fully Threaded Black Zinc (Pack Qty 10,000) BC-0404FPPBZ

Phillips Pan Thread Cutting Screw Type F Fully Threaded Black Zinc

Steel thread-cutters are used in heavy gauge sheet metal, aluminum, zinc and lead die castings, cast iron, brass and plastic. Stainless screws offer additional resistance to corrosion, 18-8 moreso than 410. When using any thread-cutting screw, the material in which the threads are cut should have a lower hardness by at least 10 to 20 Rockwell hardness points